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Operating Systems

  • What an OS does: abstraction, resource management, isolation
  • Processes: creation (fork/exec), process states, PCB, context switching
  • Threads: kernel threads vs user threads, pthreads, thread pools
  • Scheduling: FCFS, SJF, round robin, priority scheduling, multilevel feedback queues, CFS (Linux)
  • Memory management: paging, segmentation, demand paging, page replacement (LRU, clock)
  • File systems: inodes, FAT, ext4, journaling, B-tree based file systems
  • I/O subsystem: buffering, spooling, device drivers
  • System calls, user mode vs kernel mode, interrupts and traps